Reception of ground wave digital broadcasting using CATV

The reception of the ground wave digital broadcasting using CATV is a method
to receive the ground wave digital broadcasting by using the signal of the cable that not the method received with
usual UHF aerial but the CATV trader set up.

Method of receiving ground wave digital broadcasting by using CATV

If CATV is used, UHF aerial becomes unnecessary at each home. Because the
signal of CATV is transmission with the cable, a steady broadcast wave can be
received. The ground wave digital broadcasting can be received with CATV by the
following methods. If these methods are not understood, it is not possible to
receive it well.

When the BS digital broadcasting is received, the BS antenna is separately
necessary though it is natural.

The same frequency pass-through method

Frequency conversion pass-through method

Transformer modulation method

The same frequency pass-through method

Because this is transmitted like the frequency broadcast by UHF, it is called
the same frequency pass-through method. This method is an antenna of UHF and a
method with problems least. reception and any kooky [wari]It is adopted in a lot
of CATV companies.

Frequency conversion pass-through method

The frequency conversion pass-through method is a method that converts the
frequency of the ground wave digital broadcasting broadcast by UHF into a low
frequency for CATV once and transmits. Therefore, the tuner, the television, and
the DVD recorder, etc. for the ground digital television that corresponds to the
frequency conversion pass-through method are necessary.

When the channel is set, it is necessary to select CATV. The television and
the DVD recorder of the ground digital-ready should note it because there is
something that doesn't correspond to the low-pass band-pass transformation.

Transformer modulation method

The transformer modulation method is a method that is modulated again after
the CATV company receives it once with the tuner of the ground wave digital
broadcasting and transmitted with the CATV channel. A tuner that television, is
tuner that can receive the CATV channel or special is necessary. It is chiefly a
reception with an analog tuner.

Broadcasting the high-definition television of the ground wave digital
broadcasting can be seen only in a standard image quality. Naturally, recording
becomes a standard image quality, too. Moreover, a special tuner for the number
is necessary when there is a television even for how many. If it is a rental,
the charge is necessary.

Frequency used with CATV

The frequency used with CATV is as follows. The same frequency pass-through
method is transmitted like UHF signal.

VHF(L) (VHF low-channel)

90-108MHz 1-3ch (For three channels for Television Broadcasting)

MID (middle-channel)

108-170MHz C13-22ch (For ten channels only for CATV)

VHF(H) (VHF high-channel)

170-222MHz 4-12ch (For nine channels for Television Broadcasting)

SHB (super high band channel)

222-470MHz C23-C63ch (For 41 channels only for CATV)

UHF (UHF channel)

470-770MHz 13-62ch (Use it by 50 channels and the same frequency
pass-through methods for Television Broadcasting)

Frequency of conversion pass-through method

When the one of an old standard is used for the cable and the equipment, a
high frequency like UHF might not be able to be used with CATV. In this case,
the ground wave digital broadcasting is transmitted by using a frequency band
that is lower than not UHF but this in the frequency conversion pass-through
method.

Method of selecting CATV booster

It is necessary to insert the CATV booster before it distributes it and, in
this case, to make amends for the distribution loss by 4-8 distribution from
CATV to each room because the electric wave weakens considerably. In this case,
the CATV booster for the descending amplification is used.

When BS and the CS signal are mixed with the same coaxial cable, the CATV
booster for the descending amplification that amplifies BS and CS is used. It
will be easy for the choice of the model that can feed power to use the plus 15V
also for the BS antenna.

The descending regeneration of signals of the CATV booster uses the one
corresponding to 70-770MHz. Because this bandwidth is amplified almost flatly,
it is the best for the amplification of the CATV signal and the ground wave
digital broadcasting. Then, it is necessary to note it for CATV because it is
not, and the booster for U/V/BS/CS for usual antenna amplification doesn't
amplify the CATV channel.

Author:
Dai IshikawaI am a Business owner of as76.net, and a Engineer.